Interstitial myositis, unspecified forearm

This code signifies an inflammatory condition affecting the muscle tissue within the forearm, where the specific cause or type of myositis has not been identified. It indicates inflammation of the interstitial connective tissue of the muscle, rather than the muscle fibers themselves, in an unspecified forearm.

Use this code when documentation clearly states interstitial myositis affecting the forearm, but the laterality (right or left) is not specified. This code is appropriate when the physician's diagnosis explicitly uses "interstitial myositis" and the anatomical site is the forearm, without further specification of the underlying etiology.

• Ensure the documentation specifies "interstitial myositis" and not another form of myositis (e.g., infective, toxic).
• Avoid using this code if laterality (right or left forearm) is documented; instead, select the more specific M60.131 or M60.132.
• Always query the provider for greater specificity regarding the type of myositis and laterality if not clearly documented.